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A Sleepy Science: Will Humans Hibernate Their Way Through Space? Space.com

In the future, bedtime for astronauts may be more than a few evening hours of regular shuteye. It may help them reach other planets, though admittedly they would have to sleep for quite a long time.
European researchers, however, are on the case, conducting hibernation experiments that will hopefully help them understand whether humans could ever sleep through the multiple years it would take for a spaceflight to the outer planets or beyond.